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Hello ... I want to ask .... Why do I pull the car when the engine is hot and more severe when aircond in on ... Whether the vacuum pump so that fuel injection into the cause of not getting the full fuel

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Hmmmm???? il try to figer out just what you are saying????????? ok,,if you turn on the air con it takes power to drive it...lot of power!!! so with a small engine you feel this brop in engine power you also use up a lot more fuel as well,,,so your mpg drops,,,
if i feel hot i open the windows,,,its cheeper!

Posted on Jul 03, 2010

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Gasoline vehicles rarely have a vacuum pump, those are usually on diesels, for the simple fact a diesel engine doesnt create its own vacuum. The air conditioner on most newer vehicles when engaged not only turns on the the compressor clutch but the computer tells the engine to advance the timing thereby saving fuel and giving more of the power back that is lost due to more load. If the engine is getting hot and its losing power on most vehicles when they are overheating they start sputtering for various reasons but the overheating is the cause, so look into your cooling system for the problem, on most of the newer small cars that have electric fans, when you kick on the A/C it automaticly turns on the radiator fans for the condenser coil to get maximum cooling for the system, so if the fans arent kicking on in defrost (which uses the A/C) or A/C mode then the problem starts there

Posted on Jul 03, 2010

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what about your fuel pump? when it get hot it stops and when it gets cool works. It is better as soon as you do have the engine shut off when is hot,try to check if any fuel is coming from the fuel tank to the engine if it doesn't the renew the fuel pump. Also my advise is to ask your mechanic as an expert he does have the special equipment to check the fuel pressure flow to the injection system,or if it is your vehicle fitted with carburettor to check the mechanical fuel pump whether it does send fuel at all.
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http://www.fixkick.com/AirCond/heater.html

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Two common things that can make this happen are the fuel pump itself or the fuel pressure regulator. You can check the regulator yourself. it will be on the drivers side of the engine about miday down the fuel rail.There will be a red vacuum line (i think its red) going to it. Remove that line from the regulator. If you see gas the regulator is bad. If you don't see gas start the vehicle with the hose off and wait a couple of minutes and then shut off. If you see gas know replace the regulator.

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